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Table 2 Partial associations tests on headache type in child (HTC), psychiatric comorbidity in child (PCC), psychiatric disorders in parents (PDP) and frequency (FREQ) (N = 198)

From: Psychiatric disorders and headache familial recurrence: a study on 200 children and their parents

Effect name

df

Partial Chisq

P

HTC

1

31.58

<0.0001

PCC

1

18.47

<0.0001

PDP

1

5.19

<0.05

FREQ

2

99.20

<0.0001

HTC × PDP

1

7.29

<0.01

HTC × FREQ

2

6.55

<0.05

PCC × FREQ

2

5.52

=0.06

PDP × FREQ

2

6.94

<0.05

Hierarchical model selected: HTC × PDP + HTC × FREQ + PCC × FREQ + PDP × FREQ, likelihood ratio χ2 = 11.66; df = 11; P = 0.390